CVE-2026-43304: linux
Vulnerability summary
CVE-2026-43304 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.74% chance of exploitation in the next 30 days, higher than 53.6% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 28 · Related 38Timeline
- 08-05-2026PublishedVulnerability first disclosed.
- 16-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: libceph: define and enforce CEPH_MAX_KEY_LEN When decoding the key, verify that the key material would fit into a fixed-size buffer in process_auth_done() and generally has a sane length. The new CEPH_MAX_KEY_LEN check replaces the existing check for a key with no key material which is a) not universal since CEPH_CRYPTO_NONE has to be excluded and b) doesn't provide much value since a smaller than needed key is just as invalid as no key -- this has to be handled elsewhere anyway.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.74%
Chance of exploitation in the next 30 days
Percentile
54%
Versus all other CVEs
30-day change
+0.24 pp
From 0.50% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu145 products
- linux< 5.15.0-185.195 | < 6.8.0-134.134 | < 6.17.0-40.40
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.15.0-1111.118 | < 6.8.0-1060.63 | < 6.17.0-1019.19
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ cd1a677cad994021b19665ed476aea63f5d54f31, < 6405e8c680974bb74e2c98d5249fb52c7b12a6c6 | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < 8d745d38c88ecbed95f6b2b39857bf89f35a3244 | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < e1dc45d97975f9db65694d234fbddf1915176e16 | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < 1b275bd49e58752efb83767a5d1aed41356c5e64 | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931ed | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < d82467c07b03a27c3c5469b62bb3b726305a80bb | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bf | 5.11
- linux_kernel≥ 5.11, < 5.15.202 | ≥ 5.16, < 6.1.165 | ≥ 6.2, < 6.6.128 | ≥ 6.7, < 6.12.75 | ≥ 6.13, < 6.18.16 | ≥ 6.19, < 6.19.6
Debian1 product
- linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.6-1
3 vendors · 148 products
